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chromium/third_party/blink/web_tests/fast/dom/getElementsByClassName/015.html 

<html class="a">
 <head>
  <title>document.getElementsByClassName(): live updating</title>
  <script src="resources/common.js"></script>
 </head>
 <body class="a">
  <p id="r">FAIL (script did not run)</p>
  <script>
    var elms = document.getElementsByClassName("a");
    elms[1].className = "";
    t(elms, [document.documentElement]);
  </script>
 </body>
</html>